To hide their identity. This is one of the major reasons why people ask others to verify an account using their name.
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I know.
However, the point is, those people that engaged with this kind of transaction (account verification through other person's identity) will just try to verify the account. If the account needs more documents, the one who ask/paid him to verify will just ask the "victim" to send/pass another document, in which he might be willing to do it for some money.
This is also the reason why many got scammed especially with their other accounts, giving someone your personal information is not good at all even if you get paid for that, in gambling that might work but I still not suggest this. Though requiring some documents might be the last option for the site to verify your account there’s also a chance that the information you get can also be used by other gamblers since that person is selling his identity and that could compromise your account as well.